Type hints: `from __future__ import annotations`

[cclauss]

This allows Python 3.8 and 3.9 to use the streamlined type hint syntax of PEP 563 and PEP 649.

• https://docs.python.org/3/library/__future__.html#module-contents

% ruff rule UP006 # https://docs.astral.sh/ruff/rules/non-pep585-annotation/ % ruff rule UP007 # https://docs.astral.sh/ruff/rules/non-pep604-annotation/